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Browse Prior Art Database

Inductively Timed Single-Shot

IP.com Disclosure Number: IPCOM000096243D
Original Publication Date: 1963-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Schmookler, MS: AUTHOR

Abstract

An inductive pulse forming network accurately controls the timing of this single- shot multivibrator.

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Inductively Timed Single-Shot

An inductive pulse forming network accurately controls the timing of this single- shot multivibrator.

When the switch is closed, the pulse forming network generates a voltage pulse E of duration T = LI/(V-V(D2)).

A three-transistor single-shot circuit may incorporate the pulse forming network, the base-emitter characteristic of the emitter follower transistor T2 replacing the diode D1. Germanium diodes are indicated by the letter G and silicon diodes by the letter S. Resistor RX is varied to adjust the pulse width.

Initially with a +3 volt input, transistor T1 is conductive and transistor T3 is non-conductive. When the input drops to zero, the states of T1 and T3 reverse, the output of T3 holding T1 non-conductive after the input again becomes +3. For a period T, the current through inductor L causes a rise in the voltage levels at the base and the emitter of the emitter-follower T2. After this period, the inductor current falls to a value which causes a sudden drop in the voltage levels at the base and emitter of T2. As a result, there is a pulse passed through the. 1 ufd capacitor restoring T3 and T1 to their initial states. Thus, there is a zero output for the period T when the T3 is conductive.

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